apm_cpu_idle(9)

✨ apm_cpu_idle(9) ✨

okay so bestie, welcome to apm_cpu_idle(9) — the kernel API manual page you didn't know you needed 🫶 this is the tea on cpu idling for APM capable Linux, and yes it's as niche as it sounds and yes we're gonna get through it together 💅

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🌸 NAME 🌸

apm_cpu_idle — cpu idling for APM capable Linux

like, literally what it says on the tin ✨

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🎀 SYNOPSIS 🎀

int apm_cpu_idle (struct cpuidle_device *dev , struct cpuidle_driver
*drv , int index );

three args, one int coming back at you, no cap 🧚

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💖 ARGUMENTS 💖

okay so the docs are lowkey giving nothing here, but here's the roster:

• dev — -- undescribed -- 🙈 the manual really said "figure it out yourself" for this one
• drv — -- undescribed -- 😭 same energy, bestie
• index — -- undescribed -- 💀 yeah… all three are officially undescribed, not me making that up, that's literally what the page says

ngl this section is giving mystery box 🎁 but we respect the honesty

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🔥 DESCRIPTION 🔥

This is the idling function the kernel executes when APM is available. 🫡

It tries to do BIOS powermanagement based on the average system idle time. 👑 iconic behaviour honestly

Furthermore it calls the system default idle routine. 🌈 so it's doing the APM thing and the regular thing, main character energy fr fr

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🦋 SEE ALSO 🦋

Kernel file ./arch/x86/kernel/apm_32.c — and here's the whole friend group, no one left behind 💜:

• apm_error(9)
• __apm_bios_call(9)
• apm_bios_call(9)
• __apm_bios_call_simple(9)
• apm_bios_call_simple(9)
• apm_driver_version(9)
• apm_get_event(9)
• set_power_state(9)
• set_system_power_state(9)
• apm_do_idle(9)
• apm_do_busy(9)
• apm_power_off(9)
• apm_enable_power_management(9)
• apm_get_power_status(9)
• apm_engage_power_management(9)
• apm_console_blank(9)

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🍓 little sign-off from your girl: this page lives under ./arch/x86/kernel and it's dated October 2026 — go read the whole squad, they're all waiting for you. stay idle, stay slay 💅✨